Abrasive polishing wheel



Nov. 14, 1961 T. DoYLE 3,008,168

ABRASIVE POLISHING WHEEL Filed Dec. 8, 1958 lari',

INVENTOR.

THOMAS DOYLE Uited 3,008,168 ABRASTVE PQLISMG WFEEL Thomas Doyle, 362 90th St., Brooklyn, NX. Filed Dec. 8, 1958, Ser. No. '778,785 1 Claim. (Cl. 15-230) This invention relates to tools and, more particularly, to power hand tools.

Ordinarily, the abrasive polishing wheels ordinarily used with power hand drills are not completely efficient because of the fact that the central securement means that holds the wheel to the spindle of the drill prevents the central portion of the polishing wheel from being placed in operative engagement with the object being worked. Accordingly, it is an object of the present invention to provide an adapter and associated fastening means for releasably securing an abrasive polishing wheel to the spindle of a power drill so as to overcome the aforementioned difficulties and enable suchpolishing wheel to be used in full face engagement with the work piece.

Another object of the present invention is to provide an abrasive polishing wheel in which the abrasive pad thereof can be quickly and easily reversed so as to utilize both faces of the pad to prolong the useful life thereof.

An additional object of the present invention is to provide an abrasive polishing wheel of the type described that can be quickly and readily installed on all types of power hand tools.

All of the foregoing and still further objects and advantages of this invention will become apparent from a study of the following specification, taken in connection with the accompanying drawing, wherein:

FIGURE 1 is a perspective view of a power hand tool embodying an abrasive polishing wheel made in accordance with the present invention;

FIGURE 2 is a transverse cross sectional View through the polishing wheel shown in FIGURE l;

FIGURE 3 is an exploded side elevational view of various fastening elements forming a part of the present invention; and

FIGURE 4 is an enlarged fragmentary transverse cross sectional view of certain parts of the entire abrasive polishing wheel assembly.

Referring now to the drawing, and more particularly to FIGURE 1 thereof, an abrasive polishing wheel assembly made in accordance with the present invention is shown -to include an abrasive pad, that may be constructed from a plurality of layers of steel Wool or the like, and formed into a circular pad reinforced by a plurality of radially extending rows of stitches 14.

As is more clearly shown in FIGURES 2 to 4 of the drawing, the abrasive pad 12 has a central sleeve 16 that integrally connects together a pair of oppositely facing and outwardly opening cups 18 having radially inwardly extending lips 19 that retain a resilient annular ring 20 therewithin.

The head 24 of a bolt type fastening element 26 is provided with an annular groove 22 that is releasably engageable within a selective one of the resilient rings to releasably secure these parts together. 'I'he opposite end of the fastener element 26 is provided with a threaded stud portion 28 that is receivable within the central opening of a mounting plate 30 of a llexible backing plate 22. The threaded portion 28 is threadedly engageable within the internally threaded bore 38 of an enlarged head 36 of a spindle 40 that may be releasably secured within the chuck of any conventional hand tool, such as a power drill 42.

In actual use, the fastening element 26, mounting plate 30, flexible backing plate 32, and spindle 40 form permanent parts of the assembly. The abrasive pad portion is expendable after it has been Worn sufficiently to warrant its replacement. Each one of the pads is provided with the centrally located sleeve 16 and cups 18 to facilitate the attachment and removal thereof relative to the head 24 of the fastening element. Since one such cup is on each side of the pad, it becomes a simple matter to reverse the pad for employing both sides thereof during any polishing operation. Since the cups are recessed below the actual surface of the pad, there is no danger of scratching the work piece or otherwise having such attachment and fastening elements interfere with the full face engagement of the abrasive pad with the work piece.

While this invention has been described with particular reference to the construction shown in the drawing, it is to be understood that such is not to be construed as imparting limitations upon the invention, which is best defined by the claim appended hereto.

Having thus described my invention, I claim as new and desire to secure by Letters Patent:

An abrasive polishing wheel comprising, in combination, a substantially flexible abrasive pad, a backing plate, a spindle, a threaded stud releasably securing said backing plate upon said spindle, snap fastener elements carried by said abrasive pad engageable with said threaded stud releasably securing said abrasive pad upon said threaded stud in full face engagement with said backing plate, said abrasive pad being of generally circular configuration, a plurality of stitches extending radially through said pad beneath said snap fastener elements and providing the enforcement thereof, said threaded stud extending axially through said backing pad threadedly engageable with said spindle, said threaded stud having a head overlying said backing plate in abutment therewith, said snap fastener elements comprising a pair of oppositely opening cups one on each face side of said pad, a sleeve connecting said cups together, resilient annular rings within each said cup for frictionally engaging with the head of said threaded stud, said head defining an encircling annular groove releasably receiving one of said resilient annular rings therewithin.

References Cited in the file of this patent UNITED STATES PATENTS 1,469,404 Bohrmann Oct. 2, 1923 1,768,507 Carr .Tune 24, 1930 y 1,877,951 Norris Sept. 20, 1932 2,229,745 Kneisley Jan. 28, 1941 2,319,923 Finnell May 25, 1943 2,819,478 Sutton Jan. 14, 1958 FOREIGN PATENTS 615,025 Germany Iune 25, 1935 804,354 Great Britain Nov. 12, 1958 

